ES2357123A1 - Counter-die cylinder for a stamping machine - Google Patents

Abstract

Counter-die cylinder (I) for a machine for stamping laminar material, which comprises a cylindrical body (2) that rotates on its own axis, at least one tubular element (3), delimiting two opposite ends, which is arranged on the cylindrical body (2), and at least one shroud (4) arranged around the corresponding said tubular element (3), which further comprises movement means linked to the two opposite ends of at least one tubular element for moving said tubular element in a longitudinal direction with respect to the axis of the cylindrical body, such that the position of the tubular element can vary along the length of the cylindrical body (2), said movement means being actuated by automated actuation means. In this way, the wear on the shrouds is reduced in a simple and automatic manner.

Description

Anti-die cylinder for a die cutting machine

Object of the invention

The present invention patent application its purpose is to register a cylinder counter-die for a die cutting machine that It incorporates notable innovations and advantages.

More specifically, the invention makes reference to an applicable counter-die cylinder, especially to a rotary die cutting machine of sheet material that it comprises a cylindrical body rotating on its own axis, at minus a tubular element disposed on the cylindrical body and a blanket arranged around the corresponding said element tubular, which allows the displacement of the tubular element in axial direction

Background of the invention

It is well known that a type of machines rotary die cutters, for example, those used for manufacture of boxes from corrugated cardboard sheets in passing a corrugated iron between two cylinders, they are provided with a die-holder cylinder in which assemble the die and an anti-die cylinder provided with blankets that are usually made of plastic material with a laminar shape, such as Polyurethane, where the blades for cutting corrugated cardboard.

Mantillas usually wear irregularly with the passage of time due to the repeated penetration of die blades, causing areas with a diameter significantly smaller and therefore, areas of less penetration or lower blade pressure, which can cause problems during die cutting operations to such an extent that it can prevent cutting and / or cause cleft problems.

A first known solution to avoid irregular wear consists of rectifying the surface of the blankets periodically. However, this solution requires for this a production downtime and / or in turn causes a accelerated wear of said blankets.

Another solution known by the headline for reducing this inconvenience consists in applying an axial movement slow (and small amplitude) cylinder counter-die so that the worn area of said anti-die cylinder is more distributed and not focused on a single region. This solution fails to solve completely this problem posed since it produces grooves of the cylinder displacement size counter-die, whose amplitude is limited by space problems between terraces (approximately limited to 50 millimeters)

Finally, they are known and widely used in combination with the mentioned solutions, systems of rotation of the blankets so that the wear is distributed homogeneous form along all the mantillas. The problem that presents the rotation is the difficulty, danger and time to carry out the extraction and securing operations of blankets as well as the movement of blankets remaining.

Description of the invention

The present invention has been developed with the in order to provide a counter-die cylinder that solve the aforementioned problems by contributing, in addition, other additional advantages that will be apparent from The description that follows.

It is therefore an object of the invention provide a counter-die cylinder for a die-cutting machine of sheet material of the type comprising a rotating cylindrical body on its own axis, at least one tubular element, delimiting two opposite endpoints (by for example, by the side edge itself or by stop rings located at each end), which is arranged on the cylindrical body and at least one blanket arranged around the corresponding said tubular element, and is characterized by the fact that it includes means of movement linked to the stop rings to move in a longitudinal direction with respect to to the axis of the cylindrical body the said tubular element, thereby that the position of the tubular element is likely to vary as along the length of the cylindrical body, such means of being displacement driven by drive means automated

Thanks to these characteristics, the blankets they can move axially automatically without presenting  drawbacks mentioned above, that is, the shelf life without the need to carry out a grinding of the blankets since it makes a uniform wear of this and in turn automates all the movement of the set described to move said blankets.

Preferred embodiments of the object of the invention are described in dependent claims.

In a preferred embodiment, the means of displacement and automated drive means are located inside the cylindrical body. In this way, I don't know it requires an additional space to have the mechanism of displacement for the mantillas when taking advantage of the space inside the cylindrical body that is usually inside hollow and empty and, consequently, there are no problems of interference with other equipment or machine components.

Preferably, the displacement means they comprise at least one pushing element associated with the means of automated drive

Advantageously, the cylinder counter-die comprises an element of counter-pressure that exerts a force opposite to the force exerted by the thrust element.

In a particularly preferred embodiment of anti-die cylinder, the thrust element comprises a pusher member located on an axis axially movable that passes through the inside of the cylindrical body provided with a motor that can be of the reducing motor type, being the pusher member in direct contact with a stop ring disposed at a final end of the tubular element.

Also preferably, the element counter-pressure comprises a pneumatic cylinder housed in a fixed way inside the cylindrical body that includes a pusher member that is in direct contact with a second stop ring disposed at the end end opposite the end previous end.

According to another aspect of the invention, the member pusher that is part of the thrust element and the element counter-pressure comprises an annular body provided of at least one retention flap protruding outward and movable along a regatta located in the body cylindrical, the annular body being fixedly attached to a spindle connected to the engine and pneumatic cylinder, respectively.

In an alternative embodiment of the invention, the travel means and automated drive means They can be located outside the cylindrical body.

Additionally, the cylindrical body of the counter-die cylinder is provided with at least an access hatch to access in a simple and practice within it, so that in the case of maintenance or repair or replacement of any of the components that may be located inside do not require complete disassembly of the counter-die cylinder.

According to another feature of the invention, the anti-die cylinder comprises means of synchronized, so that the linear velocity of the means of displacement is synchronized with the rotational speed of the rotating cylindrical body. Such means are related to a machine control unit in which the cylinder is arranged counter-die

Other features and advantages of a cylinder counter-die object of the present invention will be apparent from the description of an embodiment preferred, but not exclusive, illustrated by way of example no limiting in the accompanying drawings, in which:

Brief description of the drawings

Figure 1.- It is a cut elevation view. longitudinally of a counter-die cylinder of according to the present invention;

Figure 2.- It is an enlarged detail view in partially sectioned perspective of a cylinder section counter-die where the means of automated drive;

Figure 3.- It is an enlarged detail view in perspective of the counter-die cylinder section partially sectioned where the element of is located counter-pressure;

Figure 4.- There are three perspective views of the counter-die cylinder of the invention in three different positions;

Figure 5.- It is a front elevation view of a second embodiment of the counter-die cylinder of the invention; Y

Figure 6.-. It is a perspective view of the embodiment shown in figure 5.

Description of a preferred embodiment

As shown in the attached figures, a realization of the counter-die cylinder for a die cutting machine (not shown), indicated in general by reference 1, especially suitable for stamping corrugated cardboard boxes, comprising a body cylindrical 2 elongated rotating on its own axis which is horizontally coupled to the machine frame or bench die cutter by means of two metal end plates 9, 10 circular, which are each provided in a way centering of a support and rotation axis 16, 17 respectively through which the turning movement is transmitted to counter-die cylinder 1 in a manner known to what is not going to go into greater detail.

In addition, as usual in this type of punching machines a plurality of elements is provided tubular 3 aligned arranged on the outer surface of the cylindrical body 2 and a plurality of blankets 4, for example, of Polyurethane, each of which is arranged around its corresponding tubular element 3.

Additionally, the cylinder counter-die 1 is provided with means of displacement, which will be detailed below, which allow carry out a displacement in a longitudinal direction of the tubular elements 3 together with the blankets 4 with respect to the axis of the cylindrical body 2, such that the position of the tubular element 3 is likely to vary along the cylindrical body length 2 performing a movement relatively slow swaying of the mantillas, that is, of a end to end of the machine bed on which it is arranged the counter-die cylinder 1, being such travel means driven by drive means automated which can be operated by means of a button located on a part of the die cutter or are connected to the cylinder's own operation counter-die 1.

As can be seen more clearly in figures 2 and 3, said displacement means comprise an element of thrust 5 associated with automated drive means and a counter-pressure element 6 susceptible to move that exerts a force opposite to the force exerted by the thrust element 5.

Making particular reference to the element of thrust 5, this comprises a pusher member located on an axis 7 axially movable that runs through the inner cavity of the cylindrical body 2 that has a reduced gearmotor 8 dimensions, with double direction of rotation being the pusher member in direct contact with a stop ring 12 disposed at one end end of tubular element 3.

On the other hand, as regards the element counter-pressure 6 (see figure 3) comprises a pneumatic cylinder 11, linked to a supply installation of compressed air that may be associated with other parts of the punching machine, whose pneumatic cylinder 11 is housed in the inside the cylindrical body 2 and which is fixed so solidarity inside it. Said element counter-pressure 6 includes a pusher member movable by means of piston 19 of cylinder 11, which is in contact with a second stop ring 13 disposed at the end end opposite to the final end mentioned above. During the operation of the counter-die cylinder 1, this pneumatic cylinder 11 exerts a constant pressure on the ring of stop 13 that can be regulated if required.

Consequently, axis 7 always works against the force exerted by the pneumatic cylinder 11 and is responsible of transmitting the final movement of the blankets 4. The change of direction of rotation of axis 7 can be carried out with the help of elements detectors or limit switches located both outside as inside the cylinder counter-die 1.

It will be apparent to any expert in the material that instead of using a pneumatic cylinder could use a hydraulic cylinder or any other system equivalent.

The two pusher members previously cited each comprise an annular body 14, 14 ' respectively, provided with retention fins 15, 15 'which protrude radially outward, and scrollable along ones regattas 18 located in the cylindrical body 2 in an arrangement radial, the number of races 18 being equal to the number of fins of retention provided. As can be seen, such retention fins 15, 15 'consist of metal plates that have a protrusion at the top that acts as a stop with a flange of the ring stop, top, maximum as a noun, top as an adverb.

A sequence of three can be seen in Figure 4 stages in which the displacement of the blankets 4 is appreciated to the left of the image, so that the stop rings 12 and 13 move together with the blankets 4 by means of the retention fins 15, 15 '. In addition, in said figure the die-holder cylinder arrangement above of the counter-die cylinder 1 described in this memory.

In a second embodiment of the invention shown in figures 5 and 6, the displacement means and the motorized drive means can be located outside the cylindrical body, where the same references have been used numeric for common elements with the realization previously described.

In this case the means of displacement of the anti-die cylinder comprise a pair of forks 20, 21 each associated with two butt rings 12, 13 located at the two opposite ends of the cylinder counter-die 1, the reciprocating displacement of such forks 20, 21 in one way similar to pusher members that have been described with anteriorly along a spindle 22 that passes in a manner parallel and separated with respect to the cylinder counter-die, as indicated by arrows in figure 5. As you can see, each of the forks is provided with a motor drive system 23, 24 respectively, which is integral to the corresponding fork 20, twenty-one.

Additionally, the stop rings 12, 13 can have an additional built-in mechanism that rotates with the tubular elements on which are the blankets avoiding the friction wear during travel operation.

It will be evident by an expert in the field that the cylindrical body / s and the blanket / s can form a single solidarity body axially movable without thereby departing from the scope of protection defined by the characteristics of the claim 1.

The details, the shapes, the dimensions and other accessory elements, as well as the materials used in the manufacture of the anti-die cylinder of the invention may be conveniently substituted by others that are technically equivalent and do not depart from the essentiality of the invention or of the scope defined by the claims to be include below.

Claims (14)

1. Counter-die cylinder (1) for a die-cutting machine of sheet material comprising a cylindrical body (2) rotating on its own axis, at least one tubular element (3), delimiting two opposite ends, arranged on the cylindrical body ( 2) and at least one blanket (4) arranged around the corresponding said tubular element (3), characterized in that it comprises means of displacement linked to the two opposite ends of the at least one tubular element to move in a longitudinal direction with respect to to the axis of the cylindrical body the said tubular element, such that the position of the tubular element is likely to vary along the length of the cylindrical body (2), such displacement means being driven by automated actuation means. 2. Counter-die cylinder (1) according to claim 1, characterized in that the displacement means and the automated actuation means are located inside the cylindrical body (2). 3. Counter-die cylinder (1) according to claim 1, characterized in that the displacement means and the automated actuation means are located outside the cylindrical body (2). 4. Counter-die cylinder (1) according to claim 2 or 3, characterized in that the displacement means comprise at least one thrust element associated with the automated actuation means. 5. Counter-die cylinder (1) according to claim 4, characterized in that it comprises a counter-pressure element that exerts a force opposite to the force exerted by the thrust element. 6. Counter-die cylinder (1) according to claim 1, characterized in that at each of the ends that cover the total length defined by at least one tubular element has a stop ring (12, 13). 7. Counter-die cylinder (1) according to claims 2, 4 and 5, characterized in that the thrust element comprises a pusher member located on an axially movable shaft that runs through the inside of the cylindrical body (2) provided of a two-way motor of rotation, the pusher member being in direct contact with one of the stop rings (12) disposed at a final end of the tubular element. 8. Counter-die cylinder (1) according to claim 2, 5 and 6, characterized in that the counter-pressure element comprises a pneumatic cylinder housed inside the cylindrical body (2) of a fixed shape that includes a movable pusher member that is in direct contact with the second stop ring (13) disposed at the end end opposite the front end end. 9. Counter-die cylinder (1) according to claim 7, characterized in that the pusher member comprises an annular body provided with at least one retaining flap protruding outwards and movable along a regatta located in the cylindrical body, the annular body being fixedly attached to a spindle connected to the motor. 10. Counter-die cylinder (1) according to claim 8, characterized in that the pusher member comprises an annular body provided with at least one retaining flap protruding outwards and movable along a regatta located in the cylindrical body, the annular body being fixedly attached to a movable piston that is part of the pneumatic cylinder. 11. Counter-die cylinder (1) according to claim 1, characterized in that it comprises a plurality of tubular elements aligned on the rotating cylindrical body (2), on which a corresponding blanket (4) is placed on each element tubular (3). 12. Counter-die cylinder (1) according to claim 1, characterized in that the cylindrical body (2) is provided with at least one access hatch to access the interior thereof. 13. Counter-die cylinder (1) according to claim 1, characterized in that the automated drive means are adjustable in speed. 14. Counter-die cylinder (1) according to claim 1, characterized in that it comprises synchronization means, such that the linear speed of the displacement means is synchronized with the rotational speed of the rotating cylindrical body.